Updated to angular 11

Now compiling with strict mode in typescript
Need to error checking now

bookie/src/app/printers/printer-detail/printer-detail.component.ts

@@ -14,9 +14,9 @@ import { PrinterService } from '../printer.service';
   styleUrls: ['./printer-detail.component.css'],
 })
 export class PrinterDetailComponent implements OnInit, AfterViewInit {
-  @ViewChild('nameElement', { static: true }) nameElement: ElementRef;
+  @ViewChild('nameElement', { static: true }) nameElement?: ElementRef;
   form: FormGroup;
-  item: Printer;
+  item: Printer = new Printer();
 
   constructor(
     private route: ActivatedRoute,
@@ -26,10 +26,7 @@ export class PrinterDetailComponent implements OnInit, AfterViewInit {
     private toaster: ToasterService,
     private ser: PrinterService,
   ) {
-    this.createForm();
-  }
-
-  createForm() {
+    // Create form
     this.form = this.fb.group({
       name: '',
       address: '',
@@ -38,7 +35,8 @@ export class PrinterDetailComponent implements OnInit, AfterViewInit {
   }
 
   ngOnInit() {
-    this.route.data.subscribe((data: { item: Printer }) => {
+    this.route.data.subscribe((value) => {
+      const data = value as { item: Printer };
       this.showItem(data.item);
     });
   }
@@ -54,7 +52,9 @@ export class PrinterDetailComponent implements OnInit, AfterViewInit {
 
   ngAfterViewInit() {
     setTimeout(() => {
-      this.nameElement.nativeElement.focus();
+      if (this.nameElement !== undefined) {
+        this.nameElement.nativeElement.focus();
+      }
     }, 0);
   }
 
@@ -71,7 +71,7 @@ export class PrinterDetailComponent implements OnInit, AfterViewInit {
   }
 
   delete() {
-    this.ser.delete(this.item.id).subscribe(
+    this.ser.delete(this.item.id as string).subscribe(
       () => {
         this.toaster.show('Success', '');
         this.router.navigateByUrl('/printers');